Environment-friendly ice melting agent prepared by using waste acetic acid produced in dimethyl phthalate production and preparation method thereof

Abstract

The invention discloses an environment-friendly ice melting agent prepared by using waste acetic acid produced in dimethyl phthalate production and a preparation method thereof. The environment-friendly ice melting agent is a liquid product, wherein the total mass percent of acetate is 10-40%, the total mass percent of sodium dihydrogen phosphate is 0.05-1%, the total mass percent of sodium silicate is 0.05-1%, the total mass percent of sodium tartrate is 0.01-0.05%, and the 0.001-0.5wt% pigment can be added in the product. The production process is simple and mainly comprises strong alkali saponification and activated carbon adsorption treatment, the corrosion inhibition component is compounded to realize the comprehensive utilization of waste acetic acid which is hard to treat. The environment-friendly ice melting agent prepared by the invention is free from extraneous odor and low in ice point, the ice melting capacity is more than 150% of that of sodium chloride, the corrosivity to the steel is less than 10% of sodium chloride, and the ice melting agent basically cannot corrode the concrete, the plurality of indexes are superior than those of the common acetate type environment-friendly ice melting product CMA at present.

Description

technical field [0001] The invention belongs to the field of environmental technology, and in particular relates to an environment-friendly deicing agent and a preparation process thereof. Background technique [0002] The ice-melting agent is mainly used in winter airports, highways, squares, parking lots, railways, urban streets and other areas covered by ice and snow. After use, it can melt ice and snow and prevent freezing. Common deicing agents are inorganic deicing agents with "chlorine salt" as the main component, such as sodium chloride, calcium chloride, magnesium chloride, potassium chloride, etc., commonly known as "icing salt", and the most used is chlorine Sodium chloride has the advantage of being cheap, but its corrosion to large public infrastructure is very serious. At present, there are two trends in the development and use of deicing agents at home and abroad: improved chlorine salt deicing agents and non-chlorinated salt deicing agents. Although the chl...

AI Technical Summary

Problems solved by technology

[0004] (1) The cost of raw materials is high and the production process is long

At present, the high production cost of acetate deicing agent is the main factor limiting its large-scale use. The price of organic deicing agent is 6 to 10 times that of chloride deicing agent, and the cost of raw material acetic acid is the main production cost. a larger proportion

[0005] (2) The freezing point is high and the ability to melt ice is limited

A lower freezing point indicates that the product can be used at a lower ambient temperature. At present, the freezing point of calcium magnesium acetate salt is above -10°C, and it has a faster melting speed between 0 and -5°C, but when the temperature is below -5°C Poor ability to melt ice

[0006] (3) There is still some corrosion to carbon steel and reinforced concrete

Acetate-type deicing agents are easy to biodegrade, and the degraded products are not harmful to the environment, but they still have a certain corrosive effect on carbon steel and reinforced concrete structures before degradation

[0007] (4) Use efficiency needs to be improved

Powder-type products are prone to sag during use, and the products are scattered with the wind and do not act on the ice layer, resulting in waste; granular products are prone to slipping and rolling during the application process, resulting in uneven application

[0008] The domestic biomedical industry produces a large amount of waste acetic acid, which has a great impact on equipment corrosion and the environment, and it is difficult to purify and recycle. Most of it is biochemically degraded or incinerated, and only a small amount is recycled in the form of salt. high problem

For example: a large amount of waste acetic acid is produced in the production of mosquito repellent, the acetic acid content is 65-70%, and the impurities are mainly ethyl acrylate, n-butylamine and other organic impurities. Since the boiling points of these components are relatively close, distillation treatment is difficult to be effective , and the smell of impurity components is extremely heavy, and the residual trace level of ethyl acrylate can be sniffed out. It is very difficult to recycle and process. It is of positive significance if a simple and efficient process can be developed to utilize this waste acetic acid

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